glr.cc, yacc.c: initialize yylloc properly

There are several issues to address here.  One is that yylloc should
be initialized when possible.  Another is that the push parser needs
to update yypushed_loc when the user modified it.  And if the parser
starts by a reduction of an empty, it uses the first location on the
stack, which, therefore, must also be initialized to this initial
location.

This is getting complex, especially since because initializing a
global (impure interface) is different from initializing a local
variable.  To simplify, the local yylloc is not initialized during its
definition.

* data/c.m4 (b4_yyloc_default_define): Replace by...
(b4_yyloc_default): this.
Adjust dependencies.
* data/glr.cc: Initialize yylloc.
* data/yacc.c (b4_declare_scanner_communication_variables):
Initialize yylloc during its definition.
Don't define yyloc_default.
(yypush_parse): The location formal is not const, as we might
initialize it.
(yyparse): Define yyloc_default.
Use it before running the user initial action.
Possibly update the first location on the stack, and the pushed
location after the user initial action.
* tests/actions.at (Initial locations): Check that the initial
location is correct.

data/c.m4

@@ -673,12 +673,11 @@ m4_define([b4_yy_location_print_define],
 #endif]])
 ])
 
-# b4_yyloc_default_define
-# -----------------------
-# Define yyloc_default, which can be used to initialize location
-# variables.
-m4_define([b4_yyloc_default_define],
-[[static YYLTYPE yyloc_default
+# b4_yyloc_default
+# ----------------
+# Expand to a possible default value for yylloc.
+m4_define([b4_yyloc_default],
+[[
 # if defined ]b4_api_PREFIX[LTYPE_IS_TRIVIAL && ]b4_api_PREFIX[LTYPE_IS_TRIVIAL
   = { ]m4_join([, ],
                m4_defn([b4_location_initial_line]),
@@ -686,5 +685,4 @@ m4_define([b4_yyloc_default_define],
                m4_defn([b4_location_initial_line]),
                m4_defn([b4_location_initial_column]))[ }
 # endif
-  ;]dnl
-])
+]])